- 'comment_parent'
	 *                                                      - 'comment_post_ID'
	 *                                                      - 'comment_type'
	 *                                                      - 'user_id'
	 *                                                      - 'comment__in'
	 *                                                      - 'meta_value'
	 *                                                      - 'meta_value_num'
	 *                                                      - The value of `$meta_key`
	 *                                                      - The array keys of `$meta_query`
	 *                                                      - false, an empty array, or 'none' to disable `ORDER BY` clause.
	 *                                                      Default: 'comment_date_gmt'.
	 *     @type string          $order                     How to order retrieved comments. Accepts 'ASC', 'DESC'.
	 *                                                      Default: 'DESC'.
	 *     @type int             $parent                    Parent ID of comment to retrieve children of.
	 *                                                      Default empty.
	 *     @type int[]           $parent__in                Array of parent IDs of comments to retrieve children for.
	 *                                                      Default empty.
	 *     @type int[]           $parent__not_in            Array of parent IDs of comments *not* to retrieve
	 *                                                      children for. Default empty.
	 *     @type int[]           $post_author__in           Array of author IDs to retrieve comments for.
	 *                                                      Default empty.
	 *     @type int[]           $post_author__not_in       Array of author IDs *not* to retrieve comments for.
	 *                                                      Default empty.
	 *     @type int             $post_id                   Limit results to those affiliated with a given post ID.
	 *                                                      Default 0.
	 *     @type int[]           $post__in                  Array of post IDs to include affiliated comments for.
	 *                                                      Default empty.
	 *     @type int[]           $post__not_in              Array of post IDs to exclude affiliated comments for.
	 *                                                      Default empty.
	 *     @type int             $post_author               Post author ID to limit results by. Default empty.
	 *     @type string|string[] $post_status               Post status or array of post statuses to retrieve
	 *                                                      affiliated comments for. Pass 'any' to match any value.
	 *                                                      Default empty.
	 *     @type string|string[] $post_type                 Post type or array of post types to retrieve affiliated
	 *                                                      comments for. Pass 'any' to match any value. Default empty.
	 *     @type string          $post_name                 Post name to retrieve affiliated comments for.
	 *                                                      Default empty.
	 *     @type int             $post_parent               Post parent ID to retrieve affiliated comments for.
	 *                                                      Default empty.
	 *     @type string          $search                    Search term(s) to retrieve matching comments for.
	 *                                                      Default empty.
	 *     @type string|array    $status                    Comment statuses to limit results by. Accepts an array
	 *                                                      or space/comma-separated list of 'hold' (`comment_status=0`),
	 *                                                      'approve' (`comment_status=1`), 'all', or a custom
	 *                                                      comment status. Default 'all'.
	 *     @type string|string[] $type                      Include comments of a given type, or array of types.
	 *                                                      Accepts 'comment', 'pings' (includes 'pingback' and
	 *                                                      'trackback'), or any custom type string. Default empty.
	 *     @type string[]        $type__in                  Include comments from a given array of comment types.
	 *                                                      Default empty.
	 *     @type string[]        $type__not_in              Exclude comments from a given array of comment types.
	 *                                                      Default empty.
	 *     @type int             $user_id                   Include comments for a specific user ID. Default empty.
	 *     @type bool|string     $hierarchical              Whether to include comment descendants in the results.
	 *                                                      - 'threaded' returns a tree, with each comment's children
	 *                                                        stored in a `children` property on the `WP_Comment` object.
	 *                                                      - 'flat' returns a flat array of found comments plus
	 *                                                        their children.
	 *                                                      - Boolean `false` leaves out descendants.
	 *                                                      The parameter is ignored (forced to `false`) when
	 *                                                      `$fields` is 'ids' or 'counts'. Accepts 'threaded',
	 *                                                      'flat', or false. Default: false.
	 *     @type string          $cache_domain              Unique cache key to be produced when this query is stored in
	 *                                                      an object cache. Default is 'core'.
	 *     @type bool            $update_comment_meta_cache Whether to prime the metadata cache for found comments.
	 *                                                      Default true.
	 *     @type bool            $update_comment_post_cache Whether to prime the cache for comment posts.
	 *                                                      Default false.
	 * }
	 */
	public function __construct( $query = '' ) {
		$this->query_var_defaults = array(
			'author_email'              => '',
			'author_url'                => '',
			'author__in'                => '',
			'author__not_in'            => '',
			'include_unapproved'        => '',
			'fields'                    => '',
			'ID'                        => '',
			'comment__in'               => '',
			'comment__not_in'           => '',
			'karma'                     => '',
			'number'                    => '',
			'offset'                    => '',
			'no_found_rows'             => true,
			'orderby'                   => '',
			'order'                     => 'DESC',
			'paged'                     => 1,
			'parent'                    => '',
			'parent__in'                => '',
			'parent__not_in'            => '',
			'post_author__in'           => '',
			'post_author__not_in'       => '',
			'post_ID'                   => '',
			'post_id'                   => 0,
			'post__in'                  => '',
			'post__not_in'              => '',
			'post_author'               => '',
			'post_name'                 => '',
			'post_parent'               => '',
			'post_status'               => '',
			'post_type'                 => '',
			'status'                    => 'all',
			'type'                      => '',
			'type__in'                  => '',
			'type__not_in'              => '',
			'user_id'                   => '',
			'search'                    => '',
			'count'                     => false,
			'meta_key'                  => '',
			'meta_value'                => '',
			'meta_query'                => '',
			'date_query'                => null, // See WP_Date_Query.
			'hierarchical'              => false,
			'cache_domain'              => 'core',
			'update_comment_meta_cache' => true,
			'update_comment_post_cache' => false,
		);

		if ( ! empty( $query ) ) {
			$this->query( $query );
		}
	}

	/**
	 * Parse arguments passed to the comment query with default query parameters.
	 *
	 * @since 4.2.0 Extracted from WP_Comment_Query::query().
	 *
	 * @param string|array $query WP_Comment_Query arguments. See WP_Comment_Query::__construct()
	 */
	public function parse_query( $query = '' ) {
		if ( empty( $query ) ) {
			$query = $this->query_vars;
		}

		$this->query_vars = wp_parse_args( $query, $this->query_var_defaults );

		/**
		 * Fires after the comment query vars have been parsed.
		 *
		 * @since 4.2.0
		 *
		 * @param WP_Comment_Query $query The WP_Comment_Query instance (passed by reference).
		 */
		do_action_ref_array( 'parse_comment_query', array( &$this ) );
	}

	/**
	 * Sets up the WordPress query for retrieving comments.
	 *
	 * @since 3.1.0
	 * @since 4.1.0 Introduced 'comment__in', 'comment__not_in', 'post_author__in',
	 *              'post_author__not_in', 'author__in', 'author__not_in', 'post__in',
	 *              'post__not_in', 'include_unapproved', 'type__in', and 'type__not_in'
	 *              arguments to $query_vars.
	 * @since 4.2.0 Moved parsing to WP_Comment_Query::parse_query().
	 *
	 * @param string|array $query Array or URL query string of parameters.
	 * @return array|int List of comments, or number of comments when 'count' is passed as a query var.
	 */
	public function query( $query ) {
		$this->query_vars = wp_parse_args( $query );
		return $this->get_comments();
	}

	/**
	 * Get a list of comments matching the query vars.
	 *
	 * @since 4.2.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return int|int[]|WP_Comment[] List of comments or number of found comments if `$count` argument is true.
	 */
	public function get_comments() {
		global $wpdb;

		$this->parse_query();

		// Parse meta query.
		$this->meta_query = new WP_Meta_Query();
		$this->meta_query->parse_query_vars( $this->query_vars );

		/**
		 * Fires before comments are retrieved.
		 *
		 * @since 3.1.0
		 *
		 * @param WP_Comment_Query $query Current instance of WP_Comment_Query (passed by reference).
		 */
		do_action_ref_array( 'pre_get_comments', array( &$this ) );

		// Reparse query vars, in case they were modified in a 'pre_get_comments' callback.
		$this->meta_query->parse_query_vars( $this->query_vars );
		if ( ! empty( $this->meta_query->queries ) ) {
			$this->meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
		}

		$comment_data = null;

		/**
		 * Filters the comments data before the query takes place.
		 *
		 * Return a non-null value to bypass WordPress' default comment queries.
		 *
		 * The expected return type from this filter depends on the value passed
		 * in the request query vars:
		 * - When `$this->query_vars['count']` is set, the filter should return
		 *   the comment count as an integer.
		 * - When `'ids' === $this->query_vars['fields']`, the filter should return
		 *   an array of comment IDs.
		 * - Otherwise the filter should return an array of WP_Comment objects.
		 *
		 * Note that if the filter returns an array of comment data, it will be assigned
		 * to the `comments` property of the current WP_Comment_Query instance.
		 *
		 * Filtering functions that require pagination information are encouraged to set
		 * the `found_comments` and `max_num_pages` properties of the WP_Comment_Query object,
		 * passed to the filter by reference. If WP_Comment_Query does not perform a database
		 * query, it will not have enough information to generate these values itself.
		 *
		 * @since 5.3.0
		 * @since 5.6.0 The returned array of comment data is assigned to the `comments` property
		 *              of the current WP_Comment_Query instance.
		 *
		 * @param array|int|null   $comment_data Return an array of comment data to short-circuit WP's comment query,
		 *                                       the comment count as an integer if `$this->query_vars['count']` is set,
		 *                                       or null to allow WP to run its normal queries.
		 * @param WP_Comment_Query $query        The WP_Comment_Query instance, passed by reference.
		 */
		$comment_data = apply_filters_ref_array( 'comments_pre_query', array( $comment_data, &$this ) );

		if ( null !== $comment_data ) {
			if ( is_array( $comment_data ) && ! $this->query_vars['count'] ) {
				$this->comments = $comment_data;
			}

			return $comment_data;
		}

		/*
		 * Only use the args defined in the query_var_defaults to compute the key,
		 * but ignore 'fields', 'update_comment_meta_cache', 'update_comment_post_cache' which does not affect query results.
		 */
		$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );
		unset( $_args['fields'], $_args['update_comment_meta_cache'], $_args['update_comment_post_cache'] );

		$key          = md5( serialize( $_args ) );
		$last_changed = wp_cache_get_last_changed( 'comment' );

		$cache_key   = "get_comments:$key:$last_changed";
		$cache_value = wp_cache_get( $cache_key, 'comment-queries' );
		if ( false === $cache_value ) {
			$comment_ids = $this->get_comment_ids();
			if ( $comment_ids ) {
				$this->set_found_comments();
			}

			$cache_value = array(
				'comment_ids'    => $comment_ids,
				'found_comments' => $this->found_comments,
			);
			wp_cache_add( $cache_key, $cache_value, 'comment-queries' );
		} else {
			$comment_ids          = $cache_value['comment_ids'];
			$this->found_comments = $cache_value['found_comments'];
		}

		if ( $this->found_comments && $this->query_vars['number'] ) {
			$this->max_num_pages = ceil( $this->found_comments / $this->query_vars['number'] );
		}

		// If querying for a count only, there's nothing more to do.
		if ( $this->query_vars['count'] ) {
			// $comment_ids is actually a count in this case.
			return (int) $comment_ids;
		}

		$comment_ids = array_map( 'intval', $comment_ids );

		if ( $this->query_vars['update_comment_meta_cache'] ) {
			wp_lazyload_comment_meta( $comment_ids );
		}

		if ( 'ids' === $this->query_vars['fields'] ) {
			$this->comments = $comment_ids;
			return $this->comments;
		}

		_prime_comment_caches( $comment_ids, false );

		// Fetch full comment objects from the primed cache.
		$_comments = array();
		foreach ( $comment_ids as $comment_id ) {
			$_comment = get_comment( $comment_id );
			if ( $_comment ) {
				$_comments[] = $_comment;
			}
		}

		// Prime comment post caches.
		if ( $this->query_vars['update_comment_post_cache'] ) {
			$comment_post_ids = array();
			foreach ( $_comments as $_comment ) {
				$comment_post_ids[] = $_comment->comment_post_ID;
			}

			_prime_post_caches( $comment_post_ids, false, false );
		}

		/**
		 * Filters the comment query results.
		 *
		 * @since 3.1.0
		 *
		 * @param WP_Comment[]     $_comments An array of comments.
		 * @param WP_Comment_Query $query     Current instance of WP_Comment_Query (passed by reference).
		 */
		$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &$this ) );

		// Convert to WP_Comment instances.
		$comments = array_map( 'get_comment', $_comments );

		if ( $this->query_vars['hierarchical'] ) {
			$comments = $this->fill_descendants( $comments );
		}

		$this->comments = $comments;
		return $this->comments;
	}

	/**
	 * Used internally to get a list of comment IDs matching the query vars.
	 *
	 * @since 4.4.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return int|array A single count of comment IDs if a count query. An array of comment IDs if a full query.
	 */
	protected function get_comment_ids() {
		global $wpdb;

		// Assemble clauses related to 'comment_approved'.
		$approved_clauses = array();

		// 'status' accepts an array or a comma-separated string.
		$status_clauses = array();
		$statuses       = wp_parse_list( $this->query_vars['status'] );

		// Empty 'status' should be interpreted as 'all'.
		if ( empty( $statuses ) ) {
			$statuses = array( 'all' );
		}

		// 'any' overrides other statuses.
		if ( ! in_array( 'any', $statuses, true ) ) {
			foreach ( $statuses as $status ) {
				switch ( $status ) {
					case 'hold':
						$status_clauses[] = "comment_approved = '0'";
						break;

					case 'approve':
						$status_clauses[] = "comment_approved = '1'";
						break;

					case 'all':
					case '':
						$status_clauses[] = "( comment_approved = '0' OR comment_approved = '1' )";
						break;

					default:
						$status_clauses[] = $wpdb->prepare( 'comment_approved = %s', $status );
						break;
				}
			}

			if ( ! empty( $status_clauses ) ) {
				$approved_clauses[] = '( ' . implode( ' OR ', $status_clauses ) . ' )';
			}
		}

		// User IDs or emails whose unapproved comments are included, regardless of $status.
		if ( ! empty( $this->query_vars['include_unapproved'] ) ) {
			$include_unapproved = wp_parse_list( $this->query_vars['include_unapproved'] );

			foreach ( $include_unapproved as $unapproved_identifier ) {
				// Numeric values are assumed to be user IDs.
				if ( is_numeric( $unapproved_identifier ) ) {
					$approved_clauses[] = $wpdb->prepare( "( user_id = %d AND comment_approved = '0' )", $unapproved_identifier );
				} else {
					// Otherwise we match against email addresses.
					if ( ! empty( $_GET['unapproved'] ) && ! empty( $_GET['moderation-hash'] ) ) {
						// Only include requested comment.
						$approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' AND {$wpdb->comments}.comment_ID = %d )", $unapproved_identifier, (int) $_GET['unapproved'] );
					} else {
						// Include all of the author's unapproved comments.
						$approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' )", $unapproved_identifier );
					}
				}
			}
		}

		// Collapse comment_approved clauses into a single OR-separated clause.
		if ( ! empty( $approved_clauses ) ) {
			if ( 1 === count( $approved_clauses ) ) {
				$this->sql_clauses['where']['approved'] = $approved_clauses[0];
			} else {
				$this->sql_clauses['where']['approved'] = '( ' . implode( ' OR ', $approved_clauses ) . ' )';
			}
		}

		$order = ( 'ASC' === strtoupper( $this->query_vars['order'] ) ) ? 'ASC' : 'DESC';

		// Disable ORDER BY with 'none', an empty array, or boolean false.
		if ( in_array( $this->query_vars['orderby'], array( 'none', array(), false ), true ) ) {
			$orderby = '';
		} elseif ( ! empty( $this->query_vars['orderby'] ) ) {
			$ordersby = is_array( $this->query_vars['orderby'] ) ?
				$this->query_vars['orderby'] :
				preg_split( '/[,\s]/', $this->query_vars['orderby'] );

			$orderby_array            = array();
			$found_orderby_comment_id = false;
			foreach ( $ordersby as $_key => $_value ) {
				if ( ! $_value ) {
					continue;
				}

				if ( is_int( $_key ) ) {
					$_orderby = $_value;
					$_order   = $order;
				} else {
					$_orderby = $_key;
					$_order   = $_value;
				}

				if ( ! $found_orderby_comment_id && in_array( $_orderby, array( 'comment_ID', 'comment__in' ), true ) ) {
					$found_orderby_comment_id = true;
				}

				$parsed = $this->parse_orderby( $_orderby );

				if ( ! $parsed ) {
					continue;
				}

				if ( 'comment__in' === $_orderby ) {
					$orderby_array[] = $parsed;
					continue;
				}

				$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
			}

			// If no valid clauses were found, order by comment_date_gmt.
			if ( empty( $orderby_array ) ) {
				$orderby_array[] = "$wpdb->comments.comment_date_gmt $order";
			}

			// To ensure determinate sorting, always include a comment_ID clause.
			if ( ! $found_orderby_comment_id ) {
				$comment_id_order = '';

				// Inherit order from comment_date or comment_date_gmt, if available.
				foreach ( $orderby_array as $orderby_clause ) {
					if ( preg_match( '/comment_date(?:_gmt)*\ (ASC|DESC)/', $orderby_clause, $match ) ) {
						$comment_id_order = $match[1];
						break;
					}
				}

				// If no date-related order is available, use the date from the first available clause.
				if ( ! $comment_id_order ) {
					foreach ( $orderby_array as $orderby_clause ) {
						if ( str_contains( 'ASC', $orderby_clause ) ) {
							$comment_id_order = 'ASC';
						} else {
							$comment_id_order = 'DESC';
						}

						break;
					}
				}

				// Default to DESC.
				if ( ! $comment_id_order ) {
					$comment_id_order = 'DESC';
				}

				$orderby_array[] = "$wpdb->comments.comment_ID $comment_id_order";
			}

			$orderby = implode( ', ', $orderby_array );
		} else {
			$orderby = "$wpdb->comments.comment_date_gmt $order";
		}

		$number = absint( $this->query_vars['number'] );
		$offset = absint( $this->query_vars['offset'] );
		$paged  = absint( $this->query_vars['paged'] );
		$limits = '';

		if ( ! empty( $number ) ) {
			if ( $offset ) {
				$limits = 'LIMIT ' . $offset . ',' . $number;
			} else {
				$limits = 'LIMIT ' . ( $number * ( $paged - 1 ) ) . ',' . $number;
			}
		}

		if ( $this->query_vars['count'] ) {
			$fields = 'COUNT(*)';
		} else {
			$fields = "$wpdb->comments.comment_ID";
		}

		$post_id = absint( $this->query_vars['post_id'] );
		if ( ! empty( $post_id ) ) {
			$this->sql_clauses['where']['post_id'] = $wpdb->prepare( 'comment_post_ID = %d', $post_id );
		}

		// Parse comment IDs for an IN clause.
		if ( ! empty( $this->query_vars['comment__in'] ) ) {
			$this->sql_clauses['where']['comment__in'] = "$wpdb->comments.comment_ID IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__in'] ) ) . ' )';
		}

		// Parse comment IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['comment__not_in'] ) ) {
			$this->sql_clauses['where']['comment__not_in'] = "$wpdb->comments.comment_ID NOT IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__not_in'] ) ) . ' )';
		}

		// Parse comment parent IDs for an IN clause.
		if ( ! empty( $this->query_vars['parent__in'] ) ) {
			$this->sql_clauses['where']['parent__in'] = 'comment_parent IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['parent__in'] ) ) . ' )';
		}

		// Parse comment parent IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['parent__not_in'] ) ) {
			$this->sql_clauses['where']['parent__not_in'] = 'comment_parent NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['parent__not_in'] ) ) . ' )';
		}

		// Parse comment post IDs for an IN clause.
		if ( ! empty( $this->query_vars['post__in'] ) ) {
			$this->sql_clauses['where']['post__in'] = 'comment_post_ID IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__in'] ) ) . ' )';
		}

		// Parse comment post IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['post__not_in'] ) ) {
			$this->sql_clauses['where']['post__not_in'] = 'comment_post_ID NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__not_in'] ) ) . ' )';
		}

		if ( '' !== $this->query_vars['author_email'] ) {
			$this->sql_clauses['where']['author_email'] = $wpdb->prepare( 'comment_author_email = %s', $this->query_vars['author_email'] );
		}

		if ( '' !== $this->query_vars['author_url'] ) {
			$this->sql_clauses['where']['author_url'] = $wpdb->prepare( 'comment_author_url = %s', $this->query_vars['author_url'] );
		}

		if ( '' !== $this->query_vars['karma'] ) {
			$this->sql_clauses['where']['karma'] = $wpdb->prepare( 'comment_karma = %d', $this->query_vars['karma'] );
		}

		// Filtering by comment_type: 'type', 'type__in', 'type__not_in'.
		$raw_types = array(
			'IN'     => array_merge( (array) $this->query_vars['type'], (array) $this->query_vars['type__in'] ),
			'NOT IN' => (array) $this->query_vars['type__not_in'],
		);

		$comment_types = array();
		foreach ( $raw_types as $operator => $_raw_types ) {
			$_raw_types = array_unique( $_raw_types );

			foreach ( $_raw_types as $type ) {
				switch ( $type ) {
					// An empty translates to 'all', for backward compatibility.
					case '':
					case 'all':
						break;

					case 'comment':
					case 'comments':
						$comment_types[ $operator ][] = "''";
						$comment_types[ $operator ][] = "'comment'";
						break;

					case 'pings':
						$comment_types[ $operator ][] = "'pingback'";
						$comment_types[ $operator ][] = "'trackback'";
						break;

					default:
						$comment_types[ $operator ][] = $wpdb->prepare( '%s', $type );
						break;
				}
			}

			if ( ! empty( $comment_types[ $operator ] ) ) {
				$types_sql = implode( ', ', $comment_types[ $operator ] );
				$this->sql_clauses['where'][ 'comment_type__' . strtolower( str_replace( ' ', '_', $operator ) ) ] = "comment_type $operator ($types_sql)";
			}
		}

		$parent = $this->query_vars['parent'];
		if ( $this->query_vars['hierarchical'] && ! $parent ) {
			$parent = 0;
		}

		if ( '' !== $parent ) {
			$this->sql_clauses['where']['parent'] = $wpdb->prepare( 'comment_parent = %d', $parent );
		}

		if ( is_array( $this->query_vars['user_id'] ) ) {
			$this->sql_clauses['where']['user_id'] = 'user_id IN (' . implode( ',', array_map( 'absint', $this->query_vars['user_id'] ) ) . ')';
		} elseif ( '' !== $this->query_vars['user_id'] ) {
			$this->sql_clauses['where']['user_id'] = $wpdb->prepare( 'user_id = %d', $this->query_vars['user_id'] );
		}

		// Falsey search strings are ignored.
		if ( isset( $this->query_vars['search'] ) && strlen( $this->query_vars['search'] ) ) {
			$search_sql = $this->get_search_sql(
				$this->query_vars['search'],
				array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' )
			);

			// Strip leading 'AND'.
			$this->sql_clauses['where']['search'] = preg_replace( '/^\s*AND\s*/', '', $search_sql );
		}

		// If any post-related query vars are passed, join the posts table.
		$join_posts_table = false;
		$plucked          = wp_array_slice_assoc( $this->query_vars, array( 'post_author', 'post_name', 'post_parent' ) );
		$post_fields      = array_filter( $plucked );

		if ( ! empty( $post_fields ) ) {
			$join_posts_table = true;
			foreach ( $post_fields as $field_name => $field_value ) {
				// $field_value may be an array.
				$esses = array_fill( 0, count( (array) $field_value ), '%s' );

				// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
				$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $field_value );
			}
		}

		// 'post_status' and 'post_type' are handled separately, due to the specialized behavior of 'any'.
		foreach ( array( 'post_status', 'post_type' ) as $field_name ) {
			$q_values = array();
			if ( ! empty( $this->query_vars[ $field_name ] ) ) {
				$q_values = $this->query_vars[ $field_name ];
				if ( ! is_array( $q_values ) ) {
					$q_values = explode( ',', $q_values );
				}

				// 'any' will cause the query var to be ignored.
				if ( in_array( 'any', $q_values, true ) || empty( $q_values ) ) {
					continue;
				}

				$join_posts_table = true;

				$esses = array_fill( 0, count( $q_values ), '%s' );

				// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
				$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $q_values );
			}
		}

		// Comment author IDs for an IN clause.
		if ( ! empty( $this->query_vars['author__in'] ) ) {
			$this->sql_clauses['where']['author__in'] = 'user_id IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__in'] ) ) . ' )';
		}

		// Comment author IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['author__not_in'] ) ) {
			$this->sql_clauses['where']['author__not_in'] = 'user_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__not_in'] ) ) . ' )';
		}

		// Post author IDs for an IN clause.
		if ( ! empty( $this->query_vars['post_author__in'] ) ) {
			$join_posts_table                              = true;
			$this->sql_clauses['where']['post_author__in'] = 'post_author IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__in'] ) ) . ' )';
		}

		// Post author IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['post_author__not_in'] ) ) {
			$join_posts_table                                  = true;
			$this->sql_clauses['where']['post_author__not_in'] = 'post_author NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__not_in'] ) ) . ' )';
		}

		$join    = '';
		$groupby = '';

		if ( $join_posts_table ) {
			$join .= "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID";
		}

		if ( ! empty( $this->meta_query_clauses ) ) {
			$join .= $this->meta_query_clauses['join'];

			// Strip leading 'AND'.
			$this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $this->meta_query_clauses['where'] );

			if ( ! $this->query_vars['count'] ) {
				$groupby = "{$wpdb->comments}.comment_ID";
			}
		}

		if ( ! empty( $this->query_vars['date_query'] ) && is_array( $this->query_vars['date_query'] ) ) {
			$this->date_query = new WP_Date_Query( $this->query_vars['date_query'], 'comment_date' );

			// Strip leading 'AND'.
			$this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() );
		}

		$where = implode( ' AND ', $this->sql_clauses['where'] );

		$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );

		/**
		 * Filters the comment query clauses.
		 *
		 * @since 3.1.0
		 *
		 * @param string[]         $clauses An associative array of comment query clauses.
		 * @param WP_Comment_Query $query   Current instance of WP_Comment_Query (passed by reference).
		 */
		$clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) );

		$fields  = isset( $clauses['fields'] ) ? $clauses['fields'] : '';
		$join    = isset( $clauses['join'] ) ? $clauses['join'] : '';
		$where   = isset( $clauses['where'] ) ? $clauses['where'] : '';
		$orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : '';
		$limits  = isset( $clauses['limits'] ) ? $clauses['limits'] : '';
		$groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : '';

		$this->filtered_where_clause = $where;

		if ( $where ) {
			$where = 'WHERE ' . $where;
		}

		if ( $groupby ) {
			$groupby = 'GROUP BY ' . $groupby;
		}

		if ( $orderby ) {
			$orderby = "ORDER BY $orderby";
		}

		$found_rows = '';
		if ( ! $this->query_vars['no_found_rows'] ) {
			$found_rows = 'SQL_CALC_FOUND_ROWS';
		}

		$this->sql_clauses['select']  = "SELECT $found_rows $fields";
		$this->sql_clauses['from']    = "FROM $wpdb->comments $join";
		$this->sql_clauses['groupby'] = $groupby;
		$this->sql_clauses['orderby'] = $orderby;
		$this->sql_clauses['limits']  = $limits;

		$this->request = "
			{$this->sql_clauses['select']}
			{$this->sql_clauses['from']}
			{$where}
			{$this->sql_clauses['groupby']}
			{$this->sql_clauses['orderby']}
			{$this->sql_clauses['limits']}
		";

		if ( $this->query_vars['count'] ) {
			return (int) $wpdb->get_var( $this->request );
		} else {
			$comment_ids = $wpdb->get_col( $this->request );
			return array_map( 'intval', $comment_ids );
		}
	}

	/**
	 * Populates found_comments and max_num_pages properties for the current
	 * query if the limit clause was used.
	 *
	 * @since 4.6.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 */
	private function set_found_comments() {
		global $wpdb;

		if ( $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) {
			/**
			 * Filters the query used to retrieve found comment count.
			 *
			 * @since 4.4.0
			 *
			 * @param string           $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'.
			 * @param WP_Comment_Query $comment_query        The `WP_Comment_Query` instance.
			 */
			$found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this );

			$this->found_comments = (int) $wpdb->get_var( $found_comments_query );
		}
	}

	/**
	 * Fetch descendants for located comments.
	 *
	 * Instead of calling `get_children()` separately on each child comment, we do a single set of queries to fetch
	 * the descendant trees for all matched top-level comments.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_Comment[] $comments Array of top-level comments whose descendants should be filled in.
	 * @return array
	 */
	protected function fill_descendants( $comments ) {
		$levels = array(
			0 => wp_list_pluck( $comments, 'comment_ID' ),
		);

		$key          = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) );
		$last_changed = wp_cache_get_last_changed( 'comment' );

		// Fetch an entire level of the descendant tree at a time.
		$level        = 0;
		$exclude_keys = array( 'parent', 'parent__in', 'parent__not_in' );
		do {
			// Parent-child relationships may be cached. Only query for those that are not.
			$child_ids           = array();
			$uncached_parent_ids = array();
			$_parent_ids         = $levels[ $level ];
			if ( $_parent_ids ) {
				$cache_keys = array();
				foreach ( $_parent_ids as $parent_id ) {
					$cache_keys[ $parent_id ] = "get_comment_child_ids:$parent_id:$key:$last_changed";
				}
				$cache_data = wp_cache_get_multiple( array_values( $cache_keys ), 'comment-queries' );
				foreach ( $_parent_ids as $parent_id ) {
					$parent_child_ids = $cache_data[ $cache_keys[ $parent_id ] ];
					if ( false !== $parent_child_ids ) {
						$child_ids = array_merge( $child_ids, $parent_child_ids );
					} else {
						$uncached_parent_ids[] = $parent_id;
					}
				}
			}

			if ( $uncached_parent_ids ) {
				// Fetch this level of comments.
				$parent_query_args = $this->query_vars;
				foreach ( $exclude_keys as $exclude_key ) {
					$parent_query_args[ $exclude_key ] = '';
				}
				$parent_query_args['parent__in']    = $uncached_parent_ids;
				$parent_query_args['no_found_rows'] = true;
				$parent_query_args['hierarchical']  = false;
				$parent_query_args['offset']        = 0;
				$parent_query_args['number']        = 0;

				$level_comments = get_comments( $parent_query_args );

				// Cache parent-child relationships.
				$parent_map = array_fill_keys( $uncached_parent_ids, array() );
				foreach ( $level_comments as $level_comment ) {
					$parent_map[ $level_comment->comment_parent ][] = $level_comment->comment_ID;
					$child_ids[]                                    = $level_comment->comment_ID;
				}

				$data = array();
				foreach ( $parent_map as $parent_id => $children ) {
					$cache_key          = "get_comment_child_ids:$parent_id:$key:$last_changed";
					$data[ $cache_key ] = $children;
				}
				wp_cache_set_multiple( $data, 'comment-queries' );
			}

			$level++;
			$levels[ $level ] = $child_ids;
		} while ( $child_ids );

		// Prime comment caches for non-top-level comments.
		$descendant_ids = array();
		for ( $i = 1, $c = count( $levels ); $i < $c; $i++ ) {
			$descendant_ids = array_merge( $descendant_ids, $levels[ $i ] );
		}

		_prime_comment_caches( $descendant_ids, $this->query_vars['update_comment_meta_cache'] );

		// Assemble a flat array of all comments + descendants.
		$all_comments = $comments;
		foreach ( $descendant_ids as $descendant_id ) {
			$all_comments[] = get_comment( $descendant_id );
		}

		// If a threaded representation was requested, build the tree.
		if ( 'threaded' === $this->query_vars['hierarchical'] ) {
			$threaded_comments = array();
			$ref               = array();
			foreach ( $all_comments as $k => $c ) {
				$_c = get_comment( $c->comment_ID );

				// If the comment isn't in the reference array, it goes in the top level of the thread.
				if ( ! isset( $ref[ $c->comment_parent ] ) ) {
					$threaded_comments[ $_c->comment_ID ] = $_c;
					$ref[ $_c->comment_ID ]               = $threaded_comments[ $_c->comment_ID ];

					// Otherwise, set it as a child of its parent.
				} else {

					$ref[ $_c->comment_parent ]->add_child( $_c );
					$ref[ $_c->comment_ID ] = $ref[ $_c->comment_parent ]->get_child( $_c->comment_ID );
				}
			}

			// Set the 'populated_children' flag, to ensure additional database queries aren't run.
			foreach ( $ref as $_ref ) {
				$_ref->populated_children( true );
			}

			$comments = $threaded_comments;
		} else {
			$comments = $all_comments;
		}

		return $comments;
	}

	/**
	 * Used internally to generate an SQL string for searching across multiple columns.
	 *
	 * @since 3.1.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string   $search  Search string.
	 * @param string[] $columns Array of columns to search.
	 * @return string Search SQL.
	 */
	protected function get_search_sql( $search, $columns ) {
		global $wpdb;

		$like = '%' . $wpdb->esc_like( $search ) . '%';

		$searches = array();
		foreach ( $columns as $column ) {
			$searches[] = $wpdb->prepare( "$column LIKE %s", $like );
		}

		return ' AND (' . implode( ' OR ', $searches ) . ')';
	}

	/**
	 * Parse and sanitize 'orderby' keys passed to the comment query.
	 *
	 * @since 4.2.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $orderby Alias for the field to order by.
	 * @return string|false Value to used in the ORDER clause. False otherwise.
	 */
	protected function parse_orderby( $orderby ) {
		global $wpdb;

		$allowed_keys = array(
			'comment_agent',
			'comment_approved',
			'comment_author',
			'comment_author_email',
			'comment_author_IP',
			'comment_author_url',
			'comment_content',
			'comment_date',
			'comment_date_gmt',
			'comment_ID',
			'comment_karma',
			'comment_parent',
			'comment_post_ID',
			'comment_type',
			'user_id',
		);

		if ( ! empty( $this->query_vars['meta_key'] ) ) {
			$allowed_keys[] = $this->query_vars['meta_key'];
			$allowed_keys[] = 'meta_value';
			$allowed_keys[] = 'meta_value_num';
		}

		$meta_query_clauses = $this->meta_query->get_clauses();
		if ( $meta_query_clauses ) {
			$allowed_keys = array_merge( $allowed_keys, array_keys( $meta_query_clauses ) );
		}

		$parsed = false;
		if ( $this->query_vars['meta_key'] === $orderby || 'meta_value' === $orderby ) {
			$parsed = "$wpdb->commentmeta.meta_value";
		} elseif ( 'meta_value_num' === $orderby ) {
			$parsed = "$wpdb->commentmeta.meta_value+0";
		} elseif ( 'comment__in' === $orderby ) {
			$comment__in = implode( ',', array_map( 'absint', $this->query_vars['comment__in'] ) );
			$parsed      = "FIELD( {$wpdb->comments}.comment_ID, $comment__in )";
		} elseif ( in_array( $orderby, $allowed_keys, true ) ) {

			if ( isset( $meta_query_clauses[ $orderby ] ) ) {
				$meta_clause = $meta_query_clauses[ $orderby ];
				$parsed      = sprintf( 'CAST(%s.meta_value AS %s)', esc_sql( $meta_clause['alias'] ), esc_sql( $meta_clause['cast'] ) );
			} else {
				$parsed = "$wpdb->comments.$orderby";
			}
		}

		return $parsed;
	}

	/**
	 * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
	 *
	 * @since 4.2.0
	 *
	 * @param string $order The 'order' query variable.
	 * @return string The sanitized 'order' query variable.
	 */
	protected function parse_order( $order ) {
		if ( ! is_string( $order ) || empty( $order ) ) {
			return 'DESC';
		}

		if ( 'ASC' === strtoupper( $order ) ) {
			return 'ASC';
		} else {
			return 'DESC';
		}
	}
}
hecks if a given request has access to delete a post.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has access to delete the item, WP_Error object otherwise.
	 */
	public function delete_item_permissions_check( $request ) {
		$post = $this->get_post( $request['id'] );
		if ( is_wp_error( $post ) ) {
			return $post;
		}

		if ( $post && ! $this->check_delete_permission( $post ) ) {
			return new WP_Error(
				'rest_cannot_delete',
				__( 'Sorry, you are not allowed to delete this post.' ),
				array( 'status' => rest_authorization_required_code() )
			);
		}

		return true;
	}

	/**
	 * Deletes a single post.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function delete_item( $request ) {
		$post = $this->get_post( $request['id'] );
		if ( is_wp_error( $post ) ) {
			return $post;
		}

		$id    = $post->ID;
		$force = (bool) $request['force'];

		$supports_trash = ( EMPTY_TRASH_DAYS > 0 );

		if ( 'attachment' === $post->post_type ) {
			$supports_trash = $supports_trash && MEDIA_TRASH;
		}

		/**
		 * Filters whether a post is trashable.
		 *
		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
		 *
		 * Possible hook names include:
		 *
		 *  - `rest_post_trashable`
		 *  - `rest_page_trashable`
		 *  - `rest_attachment_trashable`
		 *
		 * Pass false to disable Trash support for the post.
		 *
		 * @since 4.7.0
		 *
		 * @param bool    $supports_trash Whether the post type support trashing.
		 * @param WP_Post $post           The Post object being considered for trashing support.
		 */
		$supports_trash = apply_filters( "rest_{$this->post_type}_trashable", $supports_trash, $post );

		if ( ! $this->check_delete_permission( $post ) ) {
			return new WP_Error(
				'rest_user_cannot_delete_post',
				__( 'Sorry, you are not allowed to delete this post.' ),
				array( 'status' => rest_authorization_required_code() )
			);
		}

		$request->set_param( 'context', 'edit' );

		// If we're forcing, then delete permanently.
		if ( $force ) {
			$previous = $this->prepare_item_for_response( $post, $request );
			$result   = wp_delete_post( $id, true );
			$response = new WP_REST_Response();
			$response->set_data(
				array(
					'deleted'  => true,
					'previous' => $previous->get_data(),
				)
			);
		} else {
			// If we don't support trashing for this type, error out.
			if ( ! $supports_trash ) {
				return new WP_Error(
					'rest_trash_not_supported',
					/* translators: %s: force=true */
					sprintf( __( "The post does not support trashing. Set '%s' to delete." ), 'force=true' ),
					array( 'status' => 501 )
				);
			}

			// Otherwise, only trash if we haven't already.
			if ( 'trash' === $post->post_status ) {
				return new WP_Error(
					'rest_already_trashed',
					__( 'The post has already been deleted.' ),
					array( 'status' => 410 )
				);
			}

			/*
			 * (Note that internally this falls through to `wp_delete_post()`
			 * if the Trash is disabled.)
			 */
			$result   = wp_trash_post( $id );
			$post     = get_post( $id );
			$response = $this->prepare_item_for_response( $post, $request );
		}

		if ( ! $result ) {
			return new WP_Error(
				'rest_cannot_delete',
				__( 'The post cannot be deleted.' ),
				array( 'status' => 500 )
			);
		}

		/**
		 * Fires immediately after a single post is deleted or trashed via the REST API.
		 *
		 * They dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
		 *
		 * Possible hook names include:
		 *
		 *  - `rest_delete_post`
		 *  - `rest_delete_page`
		 *  - `rest_delete_attachment`
		 *
		 * @since 4.7.0
		 *
		 * @param WP_Post          $post     The deleted or trashed post.
		 * @param WP_REST_Response $response The response data.
		 * @param WP_REST_Request  $request  The request sent to the API.
		 */
		do_action( "rest_delete_{$this->post_type}", $post, $response, $request );

		return $response;
	}

	/**
	 * Determines the allowed query_vars for a get_items() response and prepares
	 * them for WP_Query.
	 *
	 * @since 4.7.0
	 *
	 * @param array           $prepared_args Optional. Prepared WP_Query arguments. Default empty array.
	 * @param WP_REST_Request $request       Optional. Full details about the request.
	 * @return array Items query arguments.
	 */
	protected function prepare_items_query( $prepared_args = array(), $request = null ) {
		$query_args = array();

		foreach ( $prepared_args as $key => $value ) {
			/**
			 * Filters the query_vars used in get_items() for the constructed query.
			 *
			 * The dynamic portion of the hook name, `$key`, refers to the query_var key.
			 *
			 * @since 4.7.0
			 *
			 * @param string $value The query_var value.
			 */
			$query_args[ $key ] = apply_filters( "rest_query_var-{$key}", $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		}

		if ( 'post' !== $this->post_type || ! isset( $query_args['ignore_sticky_posts'] ) ) {
			$query_args['ignore_sticky_posts'] = true;
		}

		// Map to proper WP_Query orderby param.
		if ( isset( $query_args['orderby'] ) && isset( $request['orderby'] ) ) {
			$orderby_mappings = array(
				'id'            => 'ID',
				'include'       => 'post__in',
				'slug'          => 'post_name',
				'include_slugs' => 'post_name__in',
			);

			if ( isset( $orderby_mappings[ $request['orderby'] ] ) ) {
				$query_args['orderby'] = $orderby_mappings[ $request['orderby'] ];
			}
		}

		return $query_args;
	}

	/**
	 * Checks the post_date_gmt or modified_gmt and prepare any post or
	 * modified date for single post output.
	 *
	 * @since 4.7.0
	 *
	 * @param string      $date_gmt GMT publication time.
	 * @param string|null $date     Optional. Local publication time. Default null.
	 * @return string|null ISO8601/RFC3339 formatted datetime.
	 */
	protected function prepare_date_response( $date_gmt, $date = null ) {
		// Use the date if passed.
		if ( isset( $date ) ) {
			return mysql_to_rfc3339( $date );
		}

		// Return null if $date_gmt is empty/zeros.
		if ( '0000-00-00 00:00:00' === $date_gmt ) {
			return null;
		}

		// Return the formatted datetime.
		return mysql_to_rfc3339( $date_gmt );
	}

	/**
	 * Prepares a single post for create or update.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return stdClass|WP_Error Post object or WP_Error.
	 */
	protected function prepare_item_for_database( $request ) {
		$prepared_post  = new stdClass();
		$current_status = '';

		// Post ID.
		if ( isset( $request['id'] ) ) {
			$existing_post = $this->get_post( $request['id'] );
			if ( is_wp_error( $existing_post ) ) {
				return $existing_post;
			}

			$prepared_post->ID = $existing_post->ID;
			$current_status    = $existing_post->post_status;
		}

		$schema = $this->get_item_schema();

		// Post title.
		if ( ! empty( $schema['properties']['title'] ) && isset( $request['title'] ) ) {
			if ( is_string( $request['title'] ) ) {
				$prepared_post->post_title = $request['title'];
			} elseif ( ! empty( $request['title']['raw'] ) ) {
				$prepared_post->post_title = $request['title']['raw'];
			}
		}

		// Post content.
		if ( ! empty( $schema['properties']['content'] ) && isset( $request['content'] ) ) {
			if ( is_string( $request['content'] ) ) {
				$prepared_post->post_content = $request['content'];
			} elseif ( isset( $request['content']['raw'] ) ) {
				$prepared_post->post_content = $request['content']['raw'];
			}
		}

		// Post excerpt.
		if ( ! empty( $schema['properties']['excerpt'] ) && isset( $request['excerpt'] ) ) {
			if ( is_string( $request['excerpt'] ) ) {
				$prepared_post->post_excerpt = $request['excerpt'];
			} elseif ( isset( $request['excerpt']['raw'] ) ) {
				$prepared_post->post_excerpt = $request['excerpt']['raw'];
			}
		}

		// Post type.
		if ( empty( $request['id'] ) ) {
			// Creating new post, use default type for the controller.
			$prepared_post->post_type = $this->post_type;
		} else {
			// Updating a post, use previous type.
			$prepared_post->post_type = get_post_type( $request['id'] );
		}

		$post_type = get_post_type_object( $prepared_post->post_type );

		// Post status.
		if (
			! empty( $schema['properties']['status'] ) &&
			isset( $request['status'] ) &&
			( ! $current_status || $current_status !== $request['status'] )
		) {
			$status = $this->handle_status_param( $request['status'], $post_type );

			if ( is_wp_error( $status ) ) {
				return $status;
			}

			$prepared_post->post_status = $status;
		}

		// Post date.
		if ( ! empty( $schema['properties']['date'] ) && ! empty( $request['date'] ) ) {
			$current_date = isset( $prepared_post->ID ) ? get_post( $prepared_post->ID )->post_date : false;
			$date_data    = rest_get_date_with_gmt( $request['date'] );

			if ( ! empty( $date_data ) && $current_date !== $date_data[0] ) {
				list( $prepared_post->post_date, $prepared_post->post_date_gmt ) = $date_data;
				$prepared_post->edit_date                                        = true;
			}
		} elseif ( ! empty( $schema['properties']['date_gmt'] ) && ! empty( $request['date_gmt'] ) ) {
			$current_date = isset( $prepared_post->ID ) ? get_post( $prepared_post->ID )->post_date_gmt : false;
			$date_data    = rest_get_date_with_gmt( $request['date_gmt'], true );

			if ( ! empty( $date_data ) && $current_date !== $date_data[1] ) {
				list( $prepared_post->post_date, $prepared_post->post_date_gmt ) = $date_data;
				$prepared_post->edit_date                                        = true;
			}
		}

		/*
		 * Sending a null date or date_gmt value resets date and date_gmt to their
		 * default values (`0000-00-00 00:00:00`).
		 */
		if (
			( ! empty( $schema['properties']['date_gmt'] ) && $request->has_param( 'date_gmt' ) && null === $request['date_gmt'] ) ||
			( ! empty( $schema['properties']['date'] ) && $request->has_param( 'date' ) && null === $request['date'] )
		) {
			$prepared_post->post_date_gmt = null;
			$prepared_post->post_date     = null;
		}

		// Post slug.
		if ( ! empty( $schema['properties']['slug'] ) && isset( $request['slug'] ) ) {
			$prepared_post->post_name = $request['slug'];
		}

		// Author.
		if ( ! empty( $schema['properties']['author'] ) && ! empty( $request['author'] ) ) {
			$post_author = (int) $request['author'];

			if ( get_current_user_id() !== $post_author ) {
				$user_obj = get_userdata( $post_author );

				if ( ! $user_obj ) {
					return new WP_Error(
						'rest_invalid_author',
						__( 'Invalid author ID.' ),
						array( 'status' => 400 )
					);
				}
			}

			$prepared_post->post_author = $post_author;
		}

		// Post password.
		if ( ! empty( $schema['properties']['password'] ) && isset( $request['password'] ) ) {
			$prepared_post->post_password = $request['password'];

			if ( '' !== $request['password'] ) {
				if ( ! empty( $schema['properties']['sticky'] ) && ! empty( $request['sticky'] ) ) {
					return new WP_Error(
						'rest_invalid_field',
						__( 'A post can not be sticky and have a password.' ),
						array( 'status' => 400 )
					);
				}

				if ( ! empty( $prepared_post->ID ) && is_sticky( $prepared_post->ID ) ) {
					return new WP_Error(
						'rest_invalid_field',
						__( 'A sticky post can not be password protected.' ),
						array( 'status' => 400 )
					);
				}
			}
		}

		if ( ! empty( $schema['properties']['sticky'] ) && ! empty( $request['sticky'] ) ) {
			if ( ! empty( $prepared_post->ID ) && post_password_required( $prepared_post->ID ) ) {
				return new WP_Error(
					'rest_invalid_field',
					__( 'A password protected post can not be set to sticky.' ),
					array( 'status' => 400 )
				);
			}
		}

		// Parent.
		if ( ! empty( $schema['properties']['parent'] ) && isset( $request['parent'] ) ) {
			if ( 0 === (int) $request['parent'] ) {
				$prepared_post->post_parent = 0;
			} else {
				$parent = get_post( (int) $request['parent'] );

				if ( empty( $parent ) ) {
					return new WP_Error(
						'rest_post_invalid_id',
						__( 'Invalid post parent ID.' ),
						array( 'status' => 400 )
					);
				}

				$prepared_post->post_parent = (int) $parent->ID;
			}
		}

		// Menu order.
		if ( ! empty( $schema['properties']['menu_order'] ) && isset( $request['menu_order'] ) ) {
			$prepared_post->menu_order = (int) $request['menu_order'];
		}

		// Comment status.
		if ( ! empty( $schema['properties']['comment_status'] ) && ! empty( $request['comment_status'] ) ) {
			$prepared_post->comment_status = $request['comment_status'];
		}

		// Ping status.
		if ( ! empty( $schema['properties']['ping_status'] ) && ! empty( $request['ping_status'] ) ) {
			$prepared_post->ping_status = $request['ping_status'];
		}

		if ( ! empty( $schema['properties']['template'] ) ) {
			// Force template to null so that it can be handled exclusively by the REST controller.
			$prepared_post->page_template = null;
		}

		/**
		 * Filters a post before it is inserted via the REST API.
		 *
		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
		 *
		 * Possible hook names include:
		 *
		 *  - `rest_pre_insert_post`
		 *  - `rest_pre_insert_page`
		 *  - `rest_pre_insert_attachment`
		 *
		 * @since 4.7.0
		 *
		 * @param stdClass        $prepared_post An object representing a single post prepared
		 *                                       for inserting or updating the database.
		 * @param WP_REST_Request $request       Request object.
		 */
		return apply_filters( "rest_pre_insert_{$this->post_type}", $prepared_post, $request );

	}

	/**
	 * Checks whether the status is valid for the given post.
	 *
	 * Allows for sending an update request with the current status, even if that status would not be acceptable.
	 *
	 * @since 5.6.0
	 *
	 * @param string          $status  The provided status.
	 * @param WP_REST_Request $request The request object.
	 * @param string          $param   The parameter name.
	 * @return true|WP_Error True if the status is valid, or WP_Error if not.
	 */
	public function check_status( $status, $request, $param ) {
		if ( $request['id'] ) {
			$post = $this->get_post( $request['id'] );

			if ( ! is_wp_error( $post ) && $post->post_status === $status ) {
				return true;
			}
		}

		$args = $request->get_attributes()['args'][ $param ];

		return rest_validate_value_from_schema( $status, $args, $param );
	}

	/**
	 * Determines validity and normalizes the given status parameter.
	 *
	 * @since 4.7.0
	 *
	 * @param string       $post_status Post status.
	 * @param WP_Post_Type $post_type   Post type.
	 * @return string|WP_Error Post status or WP_Error if lacking the proper permission.
	 */
	protected function handle_status_param( $post_status, $post_type ) {

		switch ( $post_status ) {
			case 'draft':
			case 'pending':
				break;
			case 'private':
				if ( ! current_user_can( $post_type->cap->publish_posts ) ) {
					return new WP_Error(
						'rest_cannot_publish',
						__( 'Sorry, you are not allowed to create private posts in this post type.' ),
						array( 'status' => rest_authorization_required_code() )
					);
				}
				break;
			case 'publish':
			case 'future':
				if ( ! current_user_can( $post_type->cap->publish_posts ) ) {
					return new WP_Error(
						'rest_cannot_publish',
						__( 'Sorry, you are not allowed to publish posts in this post type.' ),
						array( 'status' => rest_authorization_required_code() )
					);
				}
				break;
			default:
				if ( ! get_post_status_object( $post_status ) ) {
					$post_status = 'draft';
				}
				break;
		}

		return $post_status;
	}

	/**
	 * Determines the featured media based on a request param.
	 *
	 * @since 4.7.0
	 *
	 * @param int $featured_media Featured Media ID.
	 * @param int $post_id        Post ID.
	 * @return bool|WP_Error Whether the post thumbnail was successfully deleted, otherwise WP_Error.
	 */
	protected function handle_featured_media( $featured_media, $post_id ) {

		$featured_media = (int) $featured_media;
		if ( $featured_media ) {
			$result = set_post_thumbnail( $post_id, $featured_media );
			if ( $result ) {
				return true;
			} else {
				return new WP_Error(
					'rest_invalid_featured_media',
					__( 'Invalid featured media ID.' ),
					array( 'status' => 400 )
				);
			}
		} else {
			return delete_post_thumbnail( $post_id );
		}

	}

	/**
	 * Checks whether the template is valid for the given post.
	 *
	 * @since 4.9.0
	 *
	 * @param string          $template Page template filename.
	 * @param WP_REST_Request $request  Request.
	 * @return bool|WP_Error True if template is still valid or if the same as existing value, or false if template not supported.
	 */
	public function check_template( $template, $request ) {

		if ( ! $template ) {
			return true;
		}

		if ( $request['id'] ) {
			$post             = get_post( $request['id'] );
			$current_template = get_page_template_slug( $request['id'] );
		} else {
			$post             = null;
			$current_template = '';
		}

		// Always allow for updating a post to the same template, even if that template is no longer supported.
		if ( $template === $current_template ) {
			return true;
		}

		// If this is a create request, get_post() will return null and wp theme will fallback to the passed post type.
		$allowed_templates = wp_get_theme()->get_page_templates( $post, $this->post_type );

		if ( isset( $allowed_templates[ $template ] ) ) {
			return true;
		}

		return new WP_Error(
			'rest_invalid_param',
			/* translators: 1: Parameter, 2: List of valid values. */
			sprintf( __( '%1$s is not one of %2$s.' ), 'template', implode( ', ', array_keys( $allowed_templates ) ) )
		);
	}

	/**
	 * Sets the template for a post.
	 *
	 * @since 4.7.0
	 * @since 4.9.0 Added the `$validate` parameter.
	 *
	 * @param string $template Page template filename.
	 * @param int    $post_id  Post ID.
	 * @param bool   $validate Whether to validate that the template selected is valid.
	 */
	public function handle_template( $template, $post_id, $validate = false ) {

		if ( $validate && ! array_key_exists( $template, wp_get_theme()->get_page_templates( get_post( $post_id ) ) ) ) {
			$template = '';
		}

		update_post_meta( $post_id, '_wp_page_template', $template );
	}

	/**
	 * Updates the post's terms from a REST request.
	 *
	 * @since 4.7.0
	 *
	 * @param int             $post_id The post ID to update the terms form.
	 * @param WP_REST_Request $request The request object with post and terms data.
	 * @return null|WP_Error WP_Error on an error assigning any of the terms, otherwise null.
	 */
	protected function handle_terms( $post_id, $request ) {
		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );

		foreach ( $taxonomies as $taxonomy ) {
			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

			if ( ! isset( $request[ $base ] ) ) {
				continue;
			}

			$result = wp_set_object_terms( $post_id, $request[ $base ], $taxonomy->name );

			if ( is_wp_error( $result ) ) {
				return $result;
			}
		}
	}

	/**
	 * Checks whether current user can assign all terms sent with the current request.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_REST_Request $request The request object with post and terms data.
	 * @return bool Whether the current user can assign the provided terms.
	 */
	protected function check_assign_terms_permission( $request ) {
		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );
		foreach ( $taxonomies as $taxonomy ) {
			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

			if ( ! isset( $request[ $base ] ) ) {
				continue;
			}

			foreach ( (array) $request[ $base ] as $term_id ) {
				// Invalid terms will be rejected later.
				if ( ! get_term( $term_id, $taxonomy->name ) ) {
					continue;
				}

				if ( ! current_user_can( 'assign_term', (int) $term_id ) ) {
					return false;
				}
			}
		}

		return true;
	}

	/**
	 * Checks if a given post type can be viewed or managed.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_Post_Type|string $post_type Post type name or object.
	 * @return bool Whether the post type is allowed in REST.
	 */
	protected function check_is_post_type_allowed( $post_type ) {
		if ( ! is_object( $post_type ) ) {
			$post_type = get_post_type_object( $post_type );
		}

		if ( ! empty( $post_type ) && ! empty( $post_type->show_in_rest ) ) {
			return true;
		}

		return false;
	}

	/**
	 * Checks if a post can be read.
	 *
	 * Correctly handles posts with the inherit status.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_Post $post Post object.
	 * @return bool Whether the post can be read.
	 */
	public function check_read_permission( $post ) {
		$post_type = get_post_type_object( $post->post_type );
		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
			return false;
		}

		// Is the post readable?
		if ( 'publish' === $post->post_status || current_user_can( 'read_post', $post->ID ) ) {
			return true;
		}

		$post_status_obj = get_post_status_object( $post->post_status );
		if ( $post_status_obj && $post_status_obj->public ) {
			return true;
		}

		// Can we read the parent if we're inheriting?
		if ( 'inherit' === $post->post_status && $post->post_parent > 0 ) {
			$parent = get_post( $post->post_parent );
			if ( $parent ) {
				return $this->check_read_permission( $parent );
			}
		}

		/*
		 * If there isn't a parent, but the status is set to inherit, assume
		 * it's published (as per get_post_status()).
		 */
		if ( 'inherit' === $post->post_status ) {
			return true;
		}

		return false;
	}

	/**
	 * Checks if a post can be edited.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_Post $post Post object.
	 * @return bool Whether the post can be edited.
	 */
	protected function check_update_permission( $post ) {
		$post_type = get_post_type_object( $post->post_type );

		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
			return false;
		}

		return current_user_can( 'edit_post', $post->ID );
	}

	/**
	 * Checks if a post can be created.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_Post $post Post object.
	 * @return bool Whether the post can be created.
	 */
	protected function check_create_permission( $post ) {
		$post_type = get_post_type_object( $post->post_type );

		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
			return false;
		}

		return current_user_can( $post_type->cap->create_posts );
	}

	/**
	 * Checks if a post can be deleted.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_Post $post Post object.
	 * @return bool Whether the post can be deleted.
	 */
	protected function check_delete_permission( $post ) {
		$post_type = get_post_type_object( $post->post_type );

		if ( ! $this->check_is_post_type_allowed( $post_type ) ) {
			return false;
		}

		return current_user_can( 'delete_post', $post->ID );
	}

	/**
	 * Prepares a single post output for response.
	 *
	 * @since 4.7.0
	 * @since 5.9.0 Renamed `$post` to `$item` to match parent class for PHP 8 named parameter support.
	 *
	 * @param WP_Post         $item    Post object.
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $item, $request ) {
		// Restores the more descriptive, specific name for use within this method.
		$post            = $item;
		$GLOBALS['post'] = $post;

		setup_postdata( $post );

		$fields = $this->get_fields_for_response( $request );

		// Base fields for every post.
		$data = array();

		if ( rest_is_field_included( 'id', $fields ) ) {
			$data['id'] = $post->ID;
		}

		if ( rest_is_field_included( 'date', $fields ) ) {
			$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
		}

		if ( rest_is_field_included( 'date_gmt', $fields ) ) {
			/*
			 * For drafts, `post_date_gmt` may not be set, indicating that the date
			 * of the draft should be updated each time it is saved (see #38883).
			 * In this case, shim the value based on the `post_date` field
			 * with the site's timezone offset applied.
			 */
			if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
				$post_date_gmt = get_gmt_from_date( $post->post_date );
			} else {
				$post_date_gmt = $post->post_date_gmt;
			}
			$data['date_gmt'] = $this->prepare_date_response( $post_date_gmt );
		}

		if ( rest_is_field_included( 'guid', $fields ) ) {
			$data['guid'] = array(
				/** This filter is documented in wp-includes/post-template.php */
				'rendered' => apply_filters( 'get_the_guid', $post->guid, $post->ID ),
				'raw'      => $post->guid,
			);
		}

		if ( rest_is_field_included( 'modified', $fields ) ) {
			$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
		}

		if ( rest_is_field_included( 'modified_gmt', $fields ) ) {
			/*
			 * For drafts, `post_modified_gmt` may not be set (see `post_date_gmt` comments
			 * above). In this case, shim the value based on the `post_modified` field
			 * with the site's timezone offset applied.
			 */
			if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
				$post_modified_gmt = gmdate( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) );
			} else {
				$post_modified_gmt = $post->post_modified_gmt;
			}
			$data['modified_gmt'] = $this->prepare_date_response( $post_modified_gmt );
		}

		if ( rest_is_field_included( 'password', $fields ) ) {
			$data['password'] = $post->post_password;
		}

		if ( rest_is_field_included( 'slug', $fields ) ) {
			$data['slug'] = $post->post_name;
		}

		if ( rest_is_field_included( 'status', $fields ) ) {
			$data['status'] = $post->post_status;
		}

		if ( rest_is_field_included( 'type', $fields ) ) {
			$data['type'] = $post->post_type;
		}

		if ( rest_is_field_included( 'link', $fields ) ) {
			$data['link'] = get_permalink( $post->ID );
		}

		if ( rest_is_field_included( 'title', $fields ) ) {
			$data['title'] = array();
		}
		if ( rest_is_field_included( 'title.raw', $fields ) ) {
			$data['title']['raw'] = $post->post_title;
		}
		if ( rest_is_field_included( 'title.rendered', $fields ) ) {
			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );

			$data['title']['rendered'] = get_the_title( $post->ID );

			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
		}

		$has_password_filter = false;

		if ( $this->can_access_password_content( $post, $request ) ) {
			$this->password_check_passed[ $post->ID ] = true;
			// Allow access to the post, permissions already checked before.
			add_filter( 'post_password_required', array( $this, 'check_password_required' ), 10, 2 );

			$has_password_filter = true;
		}

		if ( rest_is_field_included( 'content', $fields ) ) {
			$data['content'] = array();
		}
		if ( rest_is_field_included( 'content.raw', $fields ) ) {
			$data['content']['raw'] = $post->post_content;
		}
		if ( rest_is_field_included( 'content.rendered', $fields ) ) {
			/** This filter is documented in wp-includes/post-template.php */
			$data['content']['rendered'] = post_password_required( $post ) ? '' : apply_filters( 'the_content', $post->post_content );
		}
		if ( rest_is_field_included( 'content.protected', $fields ) ) {
			$data['content']['protected'] = (bool) $post->post_password;
		}
		if ( rest_is_field_included( 'content.block_version', $fields ) ) {
			$data['content']['block_version'] = block_version( $post->post_content );
		}

		if ( rest_is_field_included( 'excerpt', $fields ) ) {
			/** This filter is documented in wp-includes/post-template.php */
			$excerpt = apply_filters( 'get_the_excerpt', $post->post_excerpt, $post );

			/** This filter is documented in wp-includes/post-template.php */
			$excerpt = apply_filters( 'the_excerpt', $excerpt );

			$data['excerpt'] = array(
				'raw'       => $post->post_excerpt,
				'rendered'  => post_password_required( $post ) ? '' : $excerpt,
				'protected' => (bool) $post->post_password,
			);
		}

		if ( $has_password_filter ) {
			// Reset filter.
			remove_filter( 'post_password_required', array( $this, 'check_password_required' ) );
		}

		if ( rest_is_field_included( 'author', $fields ) ) {
			$data['author'] = (int) $post->post_author;
		}

		if ( rest_is_field_included( 'featured_media', $fields ) ) {
			$data['featured_media'] = (int) get_post_thumbnail_id( $post->ID );
		}

		if ( rest_is_field_included( 'parent', $fields ) ) {
			$data['parent'] = (int) $post->post_parent;
		}

		if ( rest_is_field_included( 'menu_order', $fields ) ) {
			$data['menu_order'] = (int) $post->menu_order;
		}

		if ( rest_is_field_included( 'comment_status', $fields ) ) {
			$data['comment_status'] = $post->comment_status;
		}

		if ( rest_is_field_included( 'ping_status', $fields ) ) {
			$data['ping_status'] = $post->ping_status;
		}

		if ( rest_is_field_included( 'sticky', $fields ) ) {
			$data['sticky'] = is_sticky( $post->ID );
		}

		if ( rest_is_field_included( 'template', $fields ) ) {
			$template = get_page_template_slug( $post->ID );
			if ( $template ) {
				$data['template'] = $template;
			} else {
				$data['template'] = '';
			}
		}

		if ( rest_is_field_included( 'format', $fields ) ) {
			$data['format'] = get_post_format( $post->ID );

			// Fill in blank post format.
			if ( empty( $data['format'] ) ) {
				$data['format'] = 'standard';
			}
		}

		if ( rest_is_field_included( 'meta', $fields ) ) {
			$data['meta'] = $this->meta->get_value( $post->ID, $request );
		}

		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );

		foreach ( $taxonomies as $taxonomy ) {
			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

			if ( rest_is_field_included( $base, $fields ) ) {
				$terms         = get_the_terms( $post, $taxonomy->name );
				$data[ $base ] = $terms ? array_values( wp_list_pluck( $terms, 'term_id' ) ) : array();
			}
		}

		$post_type_obj = get_post_type_object( $post->post_type );
		if ( is_post_type_viewable( $post_type_obj ) && $post_type_obj->public ) {
			$permalink_template_requested = rest_is_field_included( 'permalink_template', $fields );
			$generated_slug_requested     = rest_is_field_included( 'generated_slug', $fields );

			if ( $permalink_template_requested || $generated_slug_requested ) {
				if ( ! function_exists( 'get_sample_permalink' ) ) {
					require_once ABSPATH . 'wp-admin/includes/post.php';
				}

				$sample_permalink = get_sample_permalink( $post->ID, $post->post_title, '' );

				if ( $permalink_template_requested ) {
					$data['permalink_template'] = $sample_permalink[0];
				}

				if ( $generated_slug_requested ) {
					$data['generated_slug'] = $sample_permalink[1];
				}
			}
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		// Wrap the data in a response object.
		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = $this->prepare_links( $post );
			$response->add_links( $links );

			if ( ! empty( $links['self']['href'] ) ) {
				$actions = $this->get_available_actions( $post, $request );

				$self = $links['self']['href'];

				foreach ( $actions as $rel ) {
					$response->add_link( $rel, $self );
				}
			}
		}

		/**
		 * Filters the post data for a REST API response.
		 *
		 * The dynamic portion of the hook name, `$this->post_type`, refers to the post type slug.
		 *
		 * Possible hook names include:
		 *
		 *  - `rest_prepare_post`
		 *  - `rest_prepare_page`
		 *  - `rest_prepare_attachment`
		 *
		 * @since 4.7.0
		 *
		 * @param WP_REST_Response $response The response object.
		 * @param WP_Post          $post     Post object.
		 * @param WP_REST_Request  $request  Request object.
		 */
		return apply_filters( "rest_prepare_{$this->post_type}", $response, $post, $request );
	}

	/**
	 * Overwrites the default protected title format.
	 *
	 * By default, WordPress will show password protected posts with a title of
	 * "Protected: %s", as the REST API communicates the protected status of a post
	 * in a machine readable format, we remove the "Protected: " prefix.
	 *
	 * @since 4.7.0
	 *
	 * @return string Protected title format.
	 */
	public function protected_title_format() {
		return '%s';
	}

	/**
	 * Prepares links for the request.
	 *
	 * @since 4.7.0
	 *
	 * @param WP_Post $post Post object.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $post ) {
		// Entity meta.
		$links = array(
			'self'       => array(
				'href' => rest_url( rest_get_route_for_post( $post->ID ) ),
			),
			'collection' => array(
				'href' => rest_url( rest_get_route_for_post_type_items( $this->post_type ) ),
			),
			'about'      => array(
				'href' => rest_url( 'wp/v2/types/' . $this->post_type ),
			),
		);

		if ( ( in_array( $post->post_type, array( 'post', 'page' ), true ) || post_type_supports( $post->post_type, 'author' ) )
			&& ! empty( $post->post_author ) ) {
			$links['author'] = array(
				'href'       => rest_url( 'wp/v2/users/' . $post->post_author ),
				'embeddable' => true,
			);
		}

		if ( in_array( $post->post_type, array( 'post', 'page' ), true ) || post_type_supports( $post->post_type, 'comments' ) ) {
			$replies_url = rest_url( 'wp/v2/comments' );
			$replies_url = add_query_arg( 'post', $post->ID, $replies_url );

			$links['replies'] = array(
				'href'       => $replies_url,
				'embeddable' => true,
			);
		}

		if ( in_array( $post->post_type, array( 'post', 'page' ), true ) || post_type_supports( $post->post_type, 'revisions' ) ) {
			$revisions       = wp_get_latest_revision_id_and_total_count( $post->ID );
			$revisions_count = ! is_wp_error( $revisions ) ? $revisions['count'] : 0;
			$revisions_base  = sprintf( '/%s/%s/%d/revisions', $this->namespace, $this->rest_base, $post->ID );

			$links['version-history'] = array(
				'href'  => rest_url( $revisions_base ),
				'count' => $revisions_count,
			);

			if ( $revisions_count > 0 ) {
				$links['predecessor-version'] = array(
					'href' => rest_url( $revisions_base . '/' . $revisions['latest_id'] ),
					'id'   => $revisions['latest_id'],
				);
			}
		}

		$post_type_obj = get_post_type_object( $post->post_type );

		if ( $post_type_obj->hierarchical && ! empty( $post->post_parent ) ) {
			$links['up'] = array(
				'href'       => rest_url( rest_get_route_for_post( $post->post_parent ) ),
				'embeddable' => true,
			);
		}

		// If we have a featured media, add that.
		$featured_media = get_post_thumbnail_id( $post->ID );
		if ( $featured_media ) {
			$image_url = rest_url( rest_get_route_for_post( $featured_media ) );

			$links['https://api.w.org/featuredmedia'] = array(
				'href'       => $image_url,
				'embeddable' => true,
			);
		}

		if ( ! in_array( $post->post_type, array( 'attachment', 'nav_menu_item', 'revision' ), true ) ) {
			$attachments_url = rest_url( rest_get_route_for_post_type_items( 'attachment' ) );
			$attachments_url = add_query_arg( 'parent', $post->ID, $attachments_url );

			$links['https://api.w.org/attachment'] = array(
				'href' => $attachments_url,
			);
		}

		$taxonomies = get_object_taxonomies( $post->post_type );

		if ( ! empty( $taxonomies ) ) {
			$links['https://api.w.org/term'] = array();

			foreach ( $taxonomies as $tax ) {
				$taxonomy_route = rest_get_route_for_taxonomy_items( $tax );

				// Skip taxonomies that are not public.
				if ( empty( $taxonomy_route ) ) {
					continue;
				}
				$terms_url = add_query_arg(
					'post',
					$post->ID,
					rest_url( $taxonomy_route )
				);

				$links['https://api.w.org/term'][] = array(
					'href'       => $terms_url,
					'taxonomy'   => $tax,
					'embeddable' => true,
				);
			}
		}

		return $links;
	}

	/**
	 * Gets the link relations available for the post and current user.
	 *
	 * @since 4.9.8
	 *
	 * @param WP_Post         $post    Post object.
	 * @param WP_REST_Request $request Request object.
	 * @return array List of link relations.
	 */
	protected function get_available_actions( $post, $request ) {

		if ( 'edit' !== $request['context'] ) {
			return array();
		}

		$rels = array();

		$post_type = get_post_type_object( $post->post_type );

		if ( 'attachment' !== $this->post_type && current_user_can( $post_type->cap->publish_posts ) ) {
			$rels[] = 'https://api.w.org/action-publish';
		}

		if ( current_user_can( 'unfiltered_html' ) ) {
			$rels[] = 'https://api.w.org/action-unfiltered-html';
		}

		if ( 'post' === $post_type->name ) {
			if ( current_user_can( $post_type->cap->edit_others_posts ) && current_user_can( $post_type->cap->publish_posts ) ) {
				$rels[] = 'https://api.w.org/action-sticky';
			}
		}

		if ( post_type_supports( $post_type->name, 'author' ) ) {
			if ( current_user_can( $post_type->cap->edit_others_posts ) ) {
				$rels[] = 'https://api.w.org/action-assign-author';
			}
		}

		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );

		foreach ( $taxonomies as $tax ) {
			$tax_base   = ! empty( $tax->rest_base ) ? $tax->rest_base : $tax->name;
			$create_cap = is_taxonomy_hierarchical( $tax->name ) ? $tax->cap->edit_terms : $tax->cap->assign_terms;

			if ( current_user_can( $create_cap ) ) {
				$rels[] = 'https://api.w.org/action-create-' . $tax_base;
			}

			if ( current_user_can( $tax->cap->assign_terms ) ) {
				$rels[] = 'https://api.w.org/action-assign-' . $tax_base;
			}
		}

		return $rels;
	}

	/**
	 * Retrieves the post's schema, conforming to JSON Schema.
	 *
	 * @since 4.7.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => $this->post_type,
			'type'       => 'object',
			// Base properties for every Post.
			'properties' => array(
				'date'         => array(
					'description' => __( "The date the post was published, in the site's timezone." ),
					'type'        => array( 'string', 'null' ),
					'format'      => 'date-time',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'date_gmt'     => array(
					'description' => __( 'The date the post was published, as GMT.' ),
					'type'        => array( 'string', 'null' ),
					'format'      => 'date-time',
					'context'     => array( 'view', 'edit' ),
				),
				'guid'         => array(
					'description' => __( 'The globally unique identifier for the post.' ),
					'type'        => 'object',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
					'properties'  => array(
						'raw'      => array(
							'description' => __( 'GUID for the post, as it exists in the database.' ),
							'type'        => 'string',
							'context'     => array( 'edit' ),
							'readonly'    => true,
						),
						'rendered' => array(
							'description' => __( 'GUID for the post, transformed for display.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit' ),
							'readonly'    => true,
						),
					),
				),
				'id'           => array(
					'description' => __( 'Unique identifier for the post.' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit', 'embed' ),
					'readonly'    => true,
				),
				'link'         => array(
					'description' => __( 'URL to the post.' ),
					'type'        => 'string',
					'format'      => 'uri',
					'context'     => array( 'view', 'edit', 'embed' ),
					'readonly'    => true,
				),
				'modified'     => array(
					'description' => __( "The date the post was last modified, in the site's timezone." ),
					'type'        => 'string',
					'format'      => 'date-time',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'modified_gmt' => array(
					'description' => __( 'The date the post was last modified, as GMT.' ),
					'type'        => 'string',
					'format'      => 'date-time',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'slug'         => array(
					'description' => __( 'An alphanumeric identifier for the post unique to its type.' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit', 'embed' ),
					'arg_options' => array(
						'sanitize_callback' => array( $this, 'sanitize_slug' ),
					),
				),
				'status'       => array(
					'description' => __( 'A named status for the post.' ),
					'type'        => 'string',
					'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
					'context'     => array( 'view', 'edit' ),
					'arg_options' => array(
						'validate_callback' => array( $this, 'check_status' ),
					),
				),
				'type'         => array(
					'description' => __( 'Type of post.' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit', 'embed' ),
					'readonly'    => true,
				),
				'password'     => array(
					'description' => __( 'A password to protect access to the content and excerpt.' ),
					'type'        => 'string',
					'context'     => array( 'edit' ),
				),
			),
		);

		$post_type_obj = get_post_type_object( $this->post_type );
		if ( is_post_type_viewable( $post_type_obj ) && $post_type_obj->public ) {
			$schema['properties']['permalink_template'] = array(
				'description' => __( 'Permalink template for the post.' ),
				'type'        => 'string',
				'context'     => array( 'edit' ),
				'readonly'    => true,
			);

			$schema['properties']['generated_slug'] = array(
				'description' => __( 'Slug automatically generated from the post title.' ),
				'type'        => 'string',
				'context'     => array( 'edit' ),
				'readonly'    => true,
			);
		}

		if ( $post_type_obj->hierarchical ) {
			$schema['properties']['parent'] = array(
				'description' => __( 'The ID for the parent of the post.' ),
				'type'        => 'integer',
				'context'     => array( 'view', 'edit' ),
			);
		}

		$post_type_attributes = array(
			'title',
			'editor',
			'author',
			'excerpt',
			'thumbnail',
			'comments',
			'revisions',
			'page-attributes',
			'post-formats',
			'custom-fields',
		);
		$fixed_schemas        = array(
			'post'       => array(
				'title',
				'editor',
				'author',
				'excerpt',
				'thumbnail',
				'comments',
				'revisions',
				'post-formats',
				'custom-fields',
			),
			'page'       => array(
				'title',
				'editor',
				'author',
				'excerpt',
				'thumbnail',
				'comments',
				'revisions',
				'page-attributes',
				'custom-fields',
			),
			'attachment' => array(
				'title',
				'author',
				'comments',
				'revisions',
				'custom-fields',
			),
		);

		foreach ( $post_type_attributes as $attribute ) {
			if ( isset( $fixed_schemas[ $this->post_type ] ) && ! in_array( $attribute, $fixed_schemas[ $this->post_type ], true ) ) {
				continue;
			} elseif ( ! isset( $fixed_schemas[ $this->post_type ] ) && ! post_type_supports( $this->post_type, $attribute ) ) {
				continue;
			}

			switch ( $attribute ) {

				case 'title':
					$schema['properties']['title'] = array(
						'description' => __( 'The title for the post.' ),
						'type'        => 'object',
						'context'     => array( 'view', 'edit', 'embed' ),
						'arg_options' => array(
							'sanitize_callback' => null, // Note: sanitization implemented in self::prepare_item_for_database().
							'validate_callback' => null, // Note: validation implemented in self::prepare_item_for_database().
						),
						'properties'  => array(
							'raw'      => array(
								'description' => __( 'Title for the post, as it exists in the database.' ),
								'type'        => 'string',
								'context'     => array( 'edit' ),
							),
							'rendered' => array(
								'description' => __( 'HTML title for the post, transformed for display.' ),
								'type'        => 'string',
								'context'     => array( 'view', 'edit', 'embed' ),
								'readonly'    => true,
							),
						),
					);
					break;

				case 'editor':
					$schema['properties']['content'] = array(
						'description' => __( 'The content for the post.' ),
						'type'        => 'object',
						'context'     => array( 'view', 'edit' ),
						'arg_options' => array(
							'sanitize_callback' => null, // Note: sanitization implemented in self::prepare_item_for_database().
							'validate_callback' => null, // Note: validation implemented in self::prepare_item_for_database().
						),
						'properties'  => array(
							'raw'           => array(
								'description' => __( 'Content for the post, as it exists in the database.' ),
								'type'        => 'string',
								'context'     => array( 'edit' ),
							),
							'rendered'      => array(
								'description' => __( 'HTML content for the post, transformed for display.' ),
								'type'        => 'string',
								'context'     => array( 'view', 'edit' ),
								'readonly'    => true,
							),
							'block_version' => array(
								'description' => __( 'Version of the content block format used by the post.' ),
								'type'        => 'integer',
								'context'     => array( 'edit' ),
								'readonly'    => true,
							),
							'protected'     => array(
								'description' => __( 'Whether the content is protected with a password.' ),
								'type'        => 'boolean',
								'context'     => array( 'view', 'edit', 'embed' ),
								'readonly'    => true,
							),
						),
					);
					break;

				case 'author':
					$schema['properties']['author'] = array(
						'description' => __( 'The ID for the author of the post.' ),
						'type'        => 'integer',
						'context'     => array( 'view', 'edit', 'embed' ),
					);
					break;

				case 'excerpt':
					$schema['properties']['excerpt'] = array(
						'description' => __( 'The excerpt for the post.' ),
						'type'        => 'object',
						'context'     => array( 'view', 'edit', 'embed' ),
						'arg_options' => array(
							'sanitize_callback' => null, // Note: sanitization implemented in self::prepare_item_for_database().
							'validate_callback' => null, // Note: validation implemented in self::prepare_item_for_database().
						),
						'properties'  => array(
							'raw'       => array(
								'description' => __( 'Excerpt for the post, as it exists in the database.' ),
								'type'        => 'string',
								'context'     => array( 'edit' ),
							),
							'rendered'  => array(
								'description' => __( 'HTML excerpt for the post, transformed for display.' ),
								'type'        => 'string',
								'context'     => array( 'view', 'edit', 'embed' ),
								'readonly'    => true,
							),
							'protected' => array(
								'description' => __( 'Whether the excerpt is protected with a password.' ),
								'type'        => 'boolean',
								'context'     => array( 'view', 'edit', 'embed' ),
								'readonly'    => true,
							),
						),
					);
					break;

				case 'thumbnail':
					$schema['properties']['featured_media'] = array(
						'description' => __( 'The ID of the featured media for the post.' ),
						'type'        => 'integer',
						'context'     => array( 'view', 'edit', 'embed' ),
					);
					break;

				case 'comments':
					$schema['properties']['comment_status'] = array(
						'description' => __( 'Whether or not comments are open on the post.' ),
						'type'        => 'string',
						'enum'        => array( 'open', 'closed' ),
						'context'     => array( 'view', 'edit' ),
					);
					$schema['properties']['ping_status']    = array(
						'description' => __( 'Whether or not the post can be pinged.' ),
						'type'        => 'string',
						'enum'        => array( 'open', 'closed' ),
						'context'     => array( 'view', 'edit' ),
					);
					break;

				case 'page-attributes':
					$schema['properties']['menu_order'] = array(
						'description' => __( 'The order of the post in relation to other posts.' ),
						'type'        => 'integer',
						'context'     => array( 'view', 'edit' ),
					);
					break;

				case 'post-formats':
					// Get the native post formats and remove the array keys.
					$formats = array_values( get_post_format_slugs() );

					$schema['properties']['format'] = array(
						'description' => __( 'The format for the post.' ),
						'type'        => 'string',
						'enum'        => $formats,
						'context'     => array( 'view', 'edit' ),
					);
					break;

				case 'custom-fields':
					$schema['properties']['meta'] = $this->meta->get_field_schema();
					break;

			}
		}

		if ( 'post' === $this->post_type ) {
			$schema['properties']['sticky'] = array(
				'description' => __( 'Whether or not the post should be treated as sticky.' ),
				'type'        => 'boolean',
				'context'     => array( 'view', 'edit' ),
			);
		}

		$schema['properties']['template'] = array(
			'description' => __( 'The theme file to use to display the post.' ),
			'type'        => 'string',
			'context'     => array( 'view', 'edit' ),
			'arg_options' => array(
				'validate_callback' => array( $this, 'check_template' ),
			),
		);

		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );

		foreach ( $taxonomies as $taxonomy ) {
			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

			if ( array_key_exists( $base, $schema['properties'] ) ) {
				$taxonomy_field_name_with_conflict = ! empty( $taxonomy->rest_base ) ? 'rest_base' : 'name';
				_doing_it_wrong(
					'register_taxonomy',
					sprintf(
						/* translators: 1: The taxonomy name, 2: The property name, either 'rest_base' or 'name', 3: The conflicting value. */
						__( 'The "%1$s" taxonomy "%2$s" property (%3$s) conflicts with an existing property on the REST API Posts Controller. Specify a custom "rest_base" when registering the taxonomy to avoid this error.' ),
						$taxonomy->name,
						$taxonomy_field_name_with_conflict,
						$base
					),
					'5.4.0'
				);
			}

			$schema['properties'][ $base ] = array(
				/* translators: %s: Taxonomy name. */
				'description' => sprintf( __( 'The terms assigned to the post in the %s taxonomy.' ), $taxonomy->name ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'integer',
				),
				'context'     => array( 'view', 'edit' ),
			);
		}

		$schema_links = $this->get_schema_links();

		if ( $schema_links ) {
			$schema['links'] = $schema_links;
		}

		// Take a snapshot of which fields are in the schema pre-filtering.
		$schema_fields = array_keys( $schema['properties'] );

		/**
		 * Filters the post's schema.
		 *
		 * The dynamic portion of the filter, `$this->post_type`, refers to the
		 * post type slug for the controller.
		 *
		 * Possible hook names include:
		 *
		 *  - `rest_post_item_schema`
		 *  - `rest_page_item_schema`
		 *  - `rest_attachment_item_schema`
		 *
		 * @since 5.4.0
		 *
		 * @param array $schema Item schema data.
		 */
		$schema = apply_filters( "rest_{$this->post_type}_item_schema", $schema );

		// Emit a _doing_it_wrong warning if user tries to add new properties using this filter.
		$new_fields = array_diff( array_keys( $schema['properties'] ), $schema_fields );
		if ( count( $new_fields ) > 0 ) {
			_doing_it_wrong(
				__METHOD__,
				sprintf(
					/* translators: %s: register_rest_field */
					__( 'Please use %s to add new schema properties.' ),
					'register_rest_field'
				),
				'5.4.0'
			);
		}

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}

	/**
	 * Retrieves Link Description Objects that should be added to the Schema for the posts collection.
	 *
	 * @since 4.9.8
	 *
	 * @return array
	 */
	protected function get_schema_links() {

		$href = rest_url( "{$this->namespace}/{$this->rest_base}/{id}" );

		$links = array();

		if ( 'attachment' !== $this->post_type ) {
			$links[] = array(
				'rel'          => 'https://api.w.org/action-publish',
				'title'        => __( 'The current user can publish this post.' ),
				'href'         => $href,
				'targetSchema' => array(
					'type'       => 'object',
					'properties' => array(
						'status' => array(
							'type' => 'string',
							'enum' => array( 'publish', 'future' ),
						),
					),
				),
			);
		}

		$links[] = array(
			'rel'          => 'https://api.w.org/action-unfiltered-html',
			'title'        => __( 'The current user can post unfiltered HTML markup and JavaScript.' ),
			'href'         => $href,
			'targetSchema' => array(
				'type'       => 'object',
				'properties' => array(
					'content' => array(
						'raw' => array(
							'type' => 'string',
						),
					),
				),
			),
		);

		if ( 'post' === $this->post_type ) {
			$links[] = array(
				'rel'          => 'https://api.w.org/action-sticky',
				'title'        => __( 'The current user can sticky this post.' ),
				'href'         => $href,
				'targetSchema' => array(
					'type'       => 'object',
					'properties' => array(
						'sticky' => array(
							'type' => 'boolean',
						),
					),
				),
			);
		}

		if ( post_type_supports( $this->post_type, 'author' ) ) {
			$links[] = array(
				'rel'          => 'https://api.w.org/action-assign-author',
				'title'        => __( 'The current user can change the author on this post.' ),
				'href'         => $href,
				'targetSchema' => array(
					'type'       => 'object',
					'properties' => array(
						'author' => array(
							'type' => 'integer',
						),
					),
				),
			);
		}

		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );

		foreach ( $taxonomies as $tax ) {
			$tax_base = ! empty( $tax->rest_base ) ? $tax->rest_base : $tax->name;

			/* translators: %s: Taxonomy name. */
			$assign_title = sprintf( __( 'The current user can assign terms in the %s taxonomy.' ), $tax->name );
			/* translators: %s: Taxonomy name. */
			$create_title = sprintf( __( 'The current user can create terms in the %s taxonomy.' ), $tax->name );

			$links[] = array(
				'rel'          => 'https://api.w.org/action-assign-' . $tax_base,
				'title'        => $assign_title,
				'href'         => $href,
				'targetSchema' => array(
					'type'       => 'object',
					'properties' => array(
						$tax_base => array(
							'type'  => 'array',
							'items' => array(
								'type' => 'integer',
							),
						),
					),
				),
			);

			$links[] = array(
				'rel'          => 'https://api.w.org/action-create-' . $tax_base,
				'title'        => $create_title,
				'href'         => $href,
				'targetSchema' => array(
					'type'       => 'object',
					'properties' => array(
						$tax_base => array(
							'type'  => 'array',
							'items' => array(
								'type' => 'integer',
							),
						),
					),
				),
			);
		}

		return $links;
	}

	/**
	 * Retrieves the query params for the posts collection.
	 *
	 * @since 4.7.0
	 * @since 5.4.0 The `tax_relation` query parameter was added.
	 * @since 5.7.0 The `modified_after` and `modified_before` query parameters were added.
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		$query_params = parent::get_collection_params();

		$query_params['context']['default'] = 'view';

		$query_params['after'] = array(
			'description' => __( 'Limit response to posts published after a given ISO8601 compliant date.' ),
			'type'        => 'string',
			'format'      => 'date-time',
		);

		$query_params['modified_after'] = array(
			'description' => __( 'Limit response to posts modified after a given ISO8601 compliant date.' ),
			'type'        => 'string',
			'format'      => 'date-time',
		);

		if ( post_type_supports( $this->post_type, 'author' ) ) {
			$query_params['author']         = array(
				'description' => __( 'Limit result set to posts assigned to specific authors.' ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'integer',
				),
				'default'     => array(),
			);
			$query_params['author_exclude'] = array(
				'description' => __( 'Ensure result set excludes posts assigned to specific authors.' ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'integer',
				),
				'default'     => array(),
			);
		}

		$query_params['before'] = array(
			'description' => __( 'Limit response to posts published before a given ISO8601 compliant date.' ),
			'type'        => 'string',
			'format'      => 'date-time',
		);

		$query_params['modified_before'] = array(
			'description' => __( 'Limit response to posts modified before a given ISO8601 compliant date.' ),
			'type'        => 'string',
			'format'      => 'date-time',
		);

		$query_params['exclude'] = array(
			'description' => __( 'Ensure result set excludes specific IDs.' ),
			'type'        => 'array',
			'items'       => array(
				'type' => 'integer',
			),
			'default'     => array(),
		);

		$query_params['include'] = array(
			'description' => __( 'Limit result set to specific IDs.' ),
			'type'        => 'array',
			'items'       => array(
				'type' => 'integer',
			),
			'default'     => array(),
		);

		if ( 'page' === $this->post_type || post_type_supports( $this->post_type, 'page-attributes' ) ) {
			$query_params['menu_order'] = array(
				'description' => __( 'Limit result set to posts with a specific menu_order value.' ),
				'type'        => 'integer',
			);
		}

		$query_params['offset'] = array(
			'description' => __( 'Offset the result set by a specific number of items.' ),
			'type'        => 'integer',
		);

		$query_params['order'] = array(
			'description' => __( 'Order sort attribute ascending or descending.' ),
			'type'        => 'string',
			'default'     => 'desc',
			'enum'        => array( 'asc', 'desc' ),
		);

		$query_params['orderby'] = array(
			'description' => __( 'Sort collection by post attribute.' ),
			'type'        => 'string',
			'default'     => 'date',
			'enum'        => array(
				'author',
				'date',
				'id',
				'include',
				'modified',
				'parent',
				'relevance',
				'slug',
				'include_slugs',
				'title',
			),
		);

		if ( 'page' === $this->post_type || post_type_supports( $this->post_type, 'page-attributes' ) ) {
			$query_params['orderby']['enum'][] = 'menu_order';
		}

		$post_type = get_post_type_object( $this->post_type );

		if ( $post_type->hierarchical || 'attachment' === $this->post_type ) {
			$query_params['parent']         = array(
				'description' => __( 'Limit result set to items with particular parent IDs.' ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'integer',
				),
				'default'     => array(),
			);
			$query_params['parent_exclude'] = array(
				'description' => __( 'Limit result set to all items except those of a particular parent ID.' ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'integer',
				),
				'default'     => array(),
			);
		}

		$query_params['search_columns'] = array(
			'default'     => array(),
			'description' => __( 'Array of column names to be searched.' ),
			'type'        => 'array',
			'items'       => array(
				'enum' => array( 'post_title', 'post_content', 'post_excerpt' ),
				'type' => 'string',
			),
		);

		$query_params['slug'] = array(
			'description' => __( 'Limit result set to posts with one or more specific slugs.' ),
			'type'        => 'array',
			'items'       => array(
				'type' => 'string',
			),
		);

		$query_params['status'] = array(
			'default'           => 'publish',
			'description'       => __( 'Limit result set to posts assigned one or more statuses.' ),
			'type'              => 'array',
			'items'             => array(
				'enum' => array_merge( array_keys( get_post_stati() ), array( 'any' ) ),
				'type' => 'string',
			),
			'sanitize_callback' => array( $this, 'sanitize_post_statuses' ),
		);

		$query_params = $this->prepare_taxonomy_limit_schema( $query_params );

		if ( 'post' === $this->post_type ) {
			$query_params['sticky'] = array(
				'description' => __( 'Limit result set to items that are sticky.' ),
				'type'        => 'boolean',
			);
		}

		/**
		 * Filters collection parameters for the posts controller.
		 *
		 * The dynamic part of the filter `$this->post_type` refers to the post
		 * type slug for the controller.
		 *
		 * This filter registers the collection parameter, but does not map the
		 * collection parameter to an internal WP_Query parameter. Use the
		 * `rest_{$this->post_type}_query` filter to set WP_Query parameters.
		 *
		 * @since 4.7.0
		 *
		 * @param array        $query_params JSON Schema-formatted collection parameters.
		 * @param WP_Post_Type $post_type    Post type object.
		 */
		return apply_filters( "rest_{$this->post_type}_collection_params", $query_params, $post_type );
	}

	/**
	 * Sanitizes and validates the list of post statuses, including whether the
	 * user can query private statuses.
	 *
	 * @since 4.7.0
	 *
	 * @param string|array    $statuses  One or more post statuses.
	 * @param WP_REST_Request $request   Full details about the request.
	 * @param string          $parameter Additional parameter to pass to validation.
	 * @return array|WP_Error A list of valid statuses, otherwise WP_Error object.
	 */
	public function sanitize_post_statuses( $statuses, $request, $parameter ) {
		$statuses = wp_parse_slug_list( $statuses );

		// The default status is different in WP_REST_Attachments_Controller.
		$attributes     = $request->get_attributes();
		$default_status = $attributes['args']['status']['default'];

		foreach ( $statuses as $status ) {
			if ( $status === $default_status ) {
				continue;
			}

			$post_type_obj = get_post_type_object( $this->post_type );

			if ( current_user_can( $post_type_obj->cap->edit_posts ) || 'private' === $status && current_user_can( $post_type_obj->cap->read_private_posts ) ) {
				$result = rest_validate_request_arg( $status, $request, $parameter );
				if ( is_wp_error( $result ) ) {
					return $result;
				}
			} else {
				return new WP_Error(
					'rest_forbidden_status',
					__( 'Status is forbidden.' ),
					array( 'status' => rest_authorization_required_code() )
				);
			}
		}

		return $statuses;
	}

	/**
	 * Prepares the 'tax_query' for a collection of posts.
	 *
	 * @since 5.7.0
	 *
	 * @param array           $args    WP_Query arguments.
	 * @param WP_REST_Request $request Full details about the request.
	 * @return array Updated query arguments.
	 */
	private function prepare_tax_query( array $args, WP_REST_Request $request ) {
		$relation = $request['tax_relation'];

		if ( $relation ) {
			$args['tax_query'] = array( 'relation' => $relation );
		}

		$taxonomies = wp_list_filter(
			get_object_taxonomies( $this->post_type, 'objects' ),
			array( 'show_in_rest' => true )
		);

		foreach ( $taxonomies as $taxonomy ) {
			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;

			$tax_include = $request[ $base ];
			$tax_exclude = $request[ $base . '_exclude' ];

			if ( $tax_include ) {
				$terms            = array();
				$include_children = false;
				$operator         = 'IN';

				if ( rest_is_array( $tax_include ) ) {
					$terms = $tax_include;
				} elseif ( rest_is_object( $tax_include ) ) {
					$terms            = empty( $tax_include['terms'] ) ? array() : $tax_include['terms'];
					$include_children = ! empty( $tax_include['include_children'] );

					if ( isset( $tax_include['operator'] ) && 'AND' === $tax_include['operator'] ) {
						$operator = 'AND';
					}
				}

				if ( $terms ) {
					$args['tax_query'][] = array(
						'taxonomy'         => $taxonomy->name,
						'field'            => 'term_id',
						'terms'            => $terms,
						'include_children' => $include_children,
						'operator'         => $operator,
					);
				}
			}

			if ( $tax_exclude ) {
				$terms            = array();
				$include_children = false;

				if ( rest_is_array( $tax_exclude ) ) {
					$terms = $tax_exclude;
				} elseif ( rest_is_object( $tax_exclude ) ) {
					$terms            = empty( $tax_exclude['terms'] ) ? array() : $tax_exclude['terms'];
					$include_children = ! empty( $tax_exclude['include_children'] );
				}

				if ( $terms ) {
					$args['tax_query'][] = array(
						'taxonomy'         => $taxonomy->name,
						'field'            => 'term_id',
						'terms'            => $terms,
						'include_children' => $include_children,
						'operator'         => 'NOT IN',
					);
				}
			}
		}

		return $args;
	}

	/**
	 * Prepares the collection schema for including and excluding items by terms.
	 *
	 * @since 5.7.0
	 *
	 * @param array $query_params Collection schema.
	 * @return array Updated schema.
	 */
	private function prepare_taxonomy_limit_schema( array $query_params ) {
		$taxonomies = wp_list_filter( get_object_taxonomies( $this->post_type, 'objects' ), array( 'show_in_rest' => true ) );

		if ( ! $taxonomies ) {
			return $query_params;
		}

		$query_params['tax_relation'] = array(
			'description' => __( 'Limit result set based on relationship between multiple taxonomies.' ),
			'type'        => 'string',
			'enum'        => array( 'AND', 'OR' ),
		);

		$limit_schema = array(
			'type'  => array( 'object', 'array' ),
			'oneOf' => array(
				array(
					'title'       => __( 'Term ID List' ),
					'description' => __( 'Match terms with the listed IDs.' ),
					'type'        => 'array',
					'items'       => array(
						'type' => 'integer',
					),
				),
				array(
					'title'                => __( 'Term ID Taxonomy Query' ),
					'description'          => __( 'Perform an advanced term query.' ),
					'type'                 => 'object',
					'properties'           => array(
						'terms'            => array(
							'description' => __( 'Term IDs.' ),
							'type'        => 'array',
							'items'       => array(
								'type' => 'integer',
							),
							'default'     => array(),
						),
						'include_children' => array(
							'description' => __( 'Whether to include child terms in the terms limiting the result set.' ),
							'type'        => 'boolean',
							'default'     => false,
						),
					),
					'additionalProperties' => false,
				),
			),
		);

		$include_schema = array_merge(
			array(
				/* translators: %s: Taxonomy name. */
				'description' => __( 'Limit result set to items with specific terms assigned in the %s taxonomy.' ),
			),
			$limit_schema
		);
		// 'operator' is supported only for 'include' queries.
		$include_schema['oneOf'][1]['properties']['operator'] = array(
			'description' => __( 'Whether items must be assigned all or any of the specified terms.' ),
			'type'        => 'string',
			'enum'        => array( 'AND', 'OR' ),
			'default'     => 'OR',
		);

		$exclude_schema = array_merge(
			array(
				/* translators: %s: Taxonomy name. */
				'description' => __( 'Limit result set to items except those with specific terms assigned in the %s taxonomy.' ),
			),
			$limit_schema
		);

		foreach ( $taxonomies as $taxonomy ) {
			$base         = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
			$base_exclude = $base . '_exclude';

			$query_params[ $base ]                = $include_schema;
			$query_params[ $base ]['description'] = sprintf( $query_params[ $base ]['description'], $base );

			$query_params[ $base_exclude ]                = $exclude_schema;
			$query_params[ $base_exclude ]['description'] = sprintf( $query_params[ $base_exclude ]['description'], $base );

			if ( ! $taxonomy->hierarchical ) {
				unset( $query_params[ $base ]['oneOf'][1]['properties']['include_children'] );
				unset( $query_params[ $base_exclude ]['oneOf'][1]['properties']['include_children'] );
			}
		}

		return $query_params;
	}
}